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[04/20] x86: avoid unneeded __div64_32 function definition

Message ID 20230516193549.544673-5-arnd@kernel.org
State New
Headers show
Series x86: address -Wmissing-prototype warnings | expand

Commit Message

Arnd Bergmann May 16, 2023, 7:35 p.m. UTC 
From: Arnd Bergmann <arnd@arndb.de>

The __div64_32() function is provided for 32-bit architectures that
don't have a custom do_div() implementation. x86_32 has one, and
does not use the header file that declares the function prototype,
so the definition causes a W=1 warning:

lib/math/div64.c:31:32: error: no previous prototype for '__div64_32' [-Werror=missing-prototypes]

Define an empty macro to prevent the function definition from getting
built, which avoids the warning and saves a little .text space.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 arch/x86/include/asm/div64.h | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/arch/x86/include/asm/div64.h b/arch/x86/include/asm/div64.h
index b8f1dc0761e4..9826d5fc12e3 100644
--- a/arch/x86/include/asm/div64.h
+++ b/arch/x86/include/asm/div64.h
@@ -71,6 +71,8 @@  static inline u64 mul_u32_u32(u32 a, u32 b)
 }
 #define mul_u32_u32 mul_u32_u32
 
+#define __div64_32 /* not needed */
+
 #else
 # include <asm-generic/div64.h>